CN207866956U - DC bipolar Method of Cable Trouble Point locating test device - Google Patents

Abstract

The utility model is related to power detecting technologies,Especially DC bipolar Method of Cable Trouble Point locating test device,DC power supply is to supply electricity to voltage,The pattern of electrical resistance monitoring detection device is electrically connected voltage,Electrical resistance monitoring detection device and electrode electrically connected input terminal is corresponded to the pattern for supplying electricity to bipolar polarity automatic or manual switch unit,Voltage,Electrical resistance monitoring detection device is electrically connected with central monitoring control device with the pattern of two-way communication each other is mutually wired,To control, bipolar polarity automatic or manual switch unit carries out the pattern of automatic or manual switching to central monitoring control device and bipolar polarity automatic or manual switch unit is mutually wired is electrically connected,Electrode output corresponds to the tie point for the two 2 resistance value variable resistances that electrical connection is serially connected,Bipolar signal detection unit with central detection control apparatus by the electrical signal of its own with the pattern of two-way communication each other is mutually wired to be electrically connected.The utility model can improve the accuracy of Method of Cable Trouble Point assignment test comprehensively.

Description

DC bipolar Method of Cable Trouble Point locating test device

Technical field

The utility model is related to power detecting technologies, especially DC bipolar Method of Cable Trouble Point locating test device.

Background technology

It is all to use that cable grounding, the test of mix line fault point location, which generally use Direct Current Bridge Method, bridge test part, Unipolarity DC detecting power supply, it can also solve the problems, such as partial cables ground connection, mix line fault point location, but on-site cable failure Show complicated and again ever-changing, the positioning difficulty of fault point is very big, position inaccurate phenomenon often occurs, causes to judge cable by accident Fault point.There are unicity for the electric bridge Method of Cable Trouble Point assignment test of unipolarity DC detecting power supply power supply.

Utility model content

The purpose of this utility model is to provide a kind of DC bipolar Method of Cable Trouble Point locating test devices, using bipolarity The electric bridge Method of Cable Trouble Point assignment test of DC detecting power supply power supply, further expands Method of Cable Trouble Point assignment test mode, can The accuracy of Method of Cable Trouble Point assignment test is improved comprehensively.

What the purpose of this utility model was realized in：A kind of DC bipolar Method of Cable Trouble Point locating test device, it is bipolar Polarity automatic or manual switch unit includes first electrode terminals, second electrode terminals, voltmeter, ammeter and with the One electrode input, second electrode input terminal, first electrode output end and the DC power polarity of second electrode output end switch Device, first electrode terminals pass through the wired electrical connection second electrode terminals of voltmeter and direct wired electrical connection first electrode Input terminal, second electrode terminals by the wired electrical connection second electrode input terminal of ammeter, circuit switching device can automatically by The DC power polarity being electrically connected with first electrode terminals be conducted to first electrode output end or second electrode output end and from It is dynamic that the DC power polarity being electrically connected with second electrode terminals is conducted to second electrode output end or first electrode output end, Then make polarity and the polarity of second electrode output end of first electrode output end opposite always；DC power supply is to supply electricity to electricity Pressure, the pattern of resistor detecting device are electrically connected voltage, resistor detecting device and are switched with supplying electricity to bipolar polarity automatic or manual The pattern of unit corresponds to the first electrode for being electrically connected bipolar polarity automatic or manual switch unit DC power polarity switching device Input terminal, second electrode input terminal, voltage, resistor detecting device are with central detection control apparatus with the pattern of two-way communication each other Mutual wired electrical connection, central detection control apparatus carry out automatic or manual to control bipolar polarity automatic or manual switch unit The pattern of switching and bipolar polarity automatic or manual switch unit are mutually wired to be electrically connected and is cut with bipolar polarity automatic or manual Unit is changed with the mutually wired electrical connection of the pattern of two-way communication each other, bipolar polarity automatic or manual switch unit direct current source electrode Property the first electrode output end of switching device, second electrode output end the first resistance value that corresponding electrical connection is serially connected respectively can The tie point of variohm and the second resistance value variable resistance, the first resistance value variable resistance and the second resistance value variable resistance structure At quasi―balanced bridge circuit, the bipolar signal detection unit being made of differential operational amplifier is with defeated by the electric signal of its own Outlet is electrically connected with central detection control apparatus with the pattern of two-way communication each other is mutually wired.

DC power supply provides working power and detection power supply.

Voltage, resistance information detection device are to be detected, test to voltage and current signals, obtain required voltage, electricity The test information such as resistance.

Central detection control apparatus is coordinated to control bipolar polarity automatic or manual switch operating, provides test information, positioning Result information.

Bipolar polarity automatic or manual switch unit completes the polarity switching work of detection power supply, generates bipolar test electricity Source.Bipolar detection test can have modes, the polarity switchings such as auto polarity switching monitoring and test, the test of manual polarity switching can Take relay switching mode or electronics switching mode.

Bipolar test power supply is to detect the bipolarity generated after power supply is switched by bipolar polarity automatic or manual to test electricity Source signal.By bridge balance circuit be connected to tested ground connection, swinging cross failure cable, bridge balance is adjusted by automatic or manual, After bipolar signal detection unit detects balanced signal, intelligent measurement control device provide Method of Cable Trouble Point locating result information and Test information.

The utility model further expands Method of Cable Trouble Point assignment test mode, can improve the survey of cable fault point location comprehensively The accuracy of examination.

Description of the drawings

Below in conjunction with attached drawing, the utility model is described in further detail.

Fig. 1 is the circuit structure connection diagram of the utility model totality；

Fig. 2 is that the Key Circuit structure of the bipolar polarity automatic or manual switch unit first embodiment of the utility model connects Schematic diagram；

Fig. 3 is that the Key Circuit structure of the bipolar polarity automatic or manual switch unit second embodiment of the utility model connects Schematic diagram；

Fig. 4 is that the Key Circuit structure of the bipolar polarity automatic or manual switch unit 3rd embodiment of the utility model connects Schematic diagram；

Fig. 5 is that the Key Circuit structure of the bipolar polarity automatic or manual switch unit fourth embodiment of the utility model connects Schematic diagram；

Fig. 6 is that the bipolar polarity automatic or manual switch unit of the utility model, null-type bridge circuit and calculus of differences amplify The circuit connection structure and its First partial application method principle schematic of device；

Fig. 7 is the second local application method principle schematic of the utility model.

Specific implementation mode

A kind of DC bipolar Method of Cable Trouble Point locating test device, as shown in Figure 1, the switching of bipolar polarity automatic or manual is single Member includes first electrode terminals, second electrode terminals, voltmeter V, ammeter A and has first electrode input terminal, second The DC power polarity switching device of electrode input, first electrode output end and second electrode output end, first electrode wiring End passes through the wired electrical connection second electrode terminals of voltmeter V and direct wired electrical connection first electrode input terminal, second electrode Terminals by the wired electrical connection second electrode input terminals of ammeter A, circuit switching device can automatically by with first electrode wiring The DC power polarity of end electrical connection is conducted to first electrode output end or second electrode output end and automatically will be with second electrode The DC power polarity of terminals electrical connection is conducted to second electrode output end or first electrode output end, then makes first electrode The polarity of output end and the polarity of second electrode output end are opposite always；DC power supply is to supply electricity to voltage, resistor detecting device Pattern electrical connection voltage, resistor detecting device and with supply electricity to bipolar polarity automatic or manual switch unit pattern correspond to electricity First electrode input terminal, the second electrode for connecting bipolar polarity automatic or manual switch unit DC power polarity switching device are defeated Entering end, voltage, resistor detecting device are electrically connected with central detection control apparatus with the pattern of two-way communication each other is mutually wired, in Centre detection control apparatus with control bipolar polarity automatic or manual switch unit carry out the pattern of automatic or manual switching with it is bipolar The mutually wired electrical connection of polarity automatic or manual switch unit and with bipolar polarity automatic or manual switch unit with two-way each other The mutually wired electrical connection of the pattern of communication, as shown in fig. 6, bipolar polarity automatic or manual switch unit DC power polarity switches The first electrode output end of device, second electrode output end the first resistance value that corresponding electrical connection one end links together respectively are variable The instant resistance value of the tie point of resistor and the second resistance value variable resistance, the first resistance value variable resistance is R1, the second resistance The instant resistance value for being worth variable resistance is R2, and the first resistance value variable resistance and the second resistance value variable resistance constitute half balance Bridge circuit, the bipolar signal detection unit being made of differential operational amplifier with by the electrical signal of its own in Entreat detection control apparatus with the mutually wired electrical connection of the pattern of two-way communication each other.

As shown in fig. 6, the detection of bipolar balanced signal, identification to electric bridge, by the differential operational amplifier of dual power supply It completes, the first resistance value variable resistance therein（Instant resistance value is R1）With the second resistance value variable resistance（Instant resistance value is R2） It is resistance value adjustable type resistor.

As shown in Figure 6, Figure 7, it is that Method of Cable Trouble Point tests Equivalent conjunction figure, by differential operational amplifier to electric bridge Bipolar balanced signal is detected, identifies, reaches bridge balance, when voltage is 0 between 4,2 end therein, Vout=0, you can Provide the position of cable grounding, mix line fault point：The good core wire of cable and the respective initiating terminal of cable fault core wire is right respectively It should be electrically connected contact 2 and 4, contact 3 is grounded, and keeps the good core wire of cable mutually firm with the respective clearing end of cable fault core wire Ground conducting links together, and the good core wire of cable and the respective resistance of cable fault core wire are R and its respective length of cable For L, the resistance corresponding to length of cable of the cable fault core wire initiating terminal to cable earth fault point is Rx, cable grounding therefore Resistance corresponding to length of cable of the barrier point to cable fault core wire clearing end is R*2-Rx, and Lx originates for cable fault core wire It holds to the length of cable of cable earth fault point, L-Lx is cable of the cable earth fault point to cable fault core wire clearing end Length, the resistance corresponding to length of cable of the cable fault core wire initiating terminal to cable earth fault point and cable earth fault point Resistance one end corresponding to length of cable to cable fault core wire clearing end interconnects and its respective other end It is separately connected the first resistance value variable resistance and the second respective other end of resistance value variable resistance, by the first resistance value variable resistance The quasi―balanced bridge and connect by being equivalent to cable fault core wire initiating terminal to cable that device is formed with the second resistance value variable resistance The resistor of resistance corresponding to the length of cable of earth fault point and to be equivalent to cable earth fault point whole to cable fault core wire Another quasi―balanced bridge of the resistor composition of the length of cable of not-go-end, which mutually encloses, is connected into complete balanced bridge, by balancing electricity Bridge group connects principle, manually or automatically the resistance of the one the first resistance value variable resistance of adjustment or the second resistance value variable resistance Value, you can the length of cable for learning cable fault core wire initiating terminal to cable earth fault point is Lx=2L/ (R1/R2+1).

Pattern to supply electricity to bipolar polarity automatic or manual switch unit, which corresponds to, is electrically connected bipolar polarity automatic or manual First electrode input terminal, the second electrode input terminal of switch unit DC power polarity switching device, voltage, resistor detecting device It is electrically connected with central detection control apparatus with the pattern of two-way communication each other is mutually wired, central detection control apparatus is double to control Pole polarity automatic or manual switch unit carries out the pattern of automatic or manual switching and bipolar polarity automatic or manual switch unit Mutual wired electrical connection is simultaneously electrically connected with bipolar polarity automatic or manual switch unit with the pattern of two-way communication each other is mutually wired It connects, the first electrode output end of bipolar polarity automatic or manual switch unit DC power polarity switching device, second electrode are defeated Symmetrical non-adjacent of a pair in the outlet bipolar signal detection unit that corresponding electrical connection is made of null-type bridge circuit respectively Bridge arm tie point, the symmetrical non-adjacent bridge arm tie point of another pair in bipolar signal detection unit respectively corresponding electrical connection by Differential operational amplifier constitute bipolar signal detection unit electric signal input end, bipolar signal detection unit with by its from The electrical signal of body is electrically connected with central detection control apparatus with the pattern of two-way communication each other is mutually wired.

The first embodiment of the utility model：As shown in Fig. 2, DC power polarity switching device includes the first circuit synchronization Switch relay and second circuit synchronism switching relay；First circuit synchronization switching relay includes being carried out by electromagnetic force The the first circuit switching electromagnetic mechanism J1B and second circuit of circuit switching switch electromagnetic mechanism J1C, and the first circuit switches electromagnetic motor Structure J1B and second circuit switching electromagnetic mechanism J1C are respectively arranged with the first incoming junction C1 and are correspondingly arranged on first respectively Output connection C2, the second output connection C3, the first circuit switches electromagnetic mechanism J1B and second circuit switches electromagnetic mechanism The respective first incoming junction C1 of J1C are respectively to should be used as first electrode input terminal and second electrode input terminal, the first circuit It is conductive that switching electromagnetic mechanism J1B and second circuit switching electromagnetic mechanism J1C is both provided with first acted by electromagnetic force Armature D1, first conductive armature D1 one end movable contacts and be electrically connected the first incoming junction C1, the first conductive armature D1 it is another End by electromagnetic force in such a way that opposite first incoming junction C1 is movable by being contacted and being electrically connected the first output connection C2 or contact are simultaneously electrically connected the second output connection C3, and the first conductive armature D1 other ends synchronous in linkage each other can contact it respectively From the first output connection C2 or the second output connection C3；Second circuit synchronism switching relay includes passing through electromagnetic force It carries out the tertiary circuit switching electromagnetic mechanism J2B of circuit switching and the 4th circuit switches electromagnetic mechanism J2C, tertiary circuit switching electricity Magnetic mechanism J2B and the 4th circuit switching electromagnetic mechanism J2C are respectively arranged with the second incoming junction C5 and third incoming junction C6 and it is each provided with third output connection C4, tertiary circuit switches electromagnetic mechanism J2B and the 4th circuit switches electromagnetic mechanism The respective third output connection C4 of J2C are respectively to should be used as first electrode output end and second electrode output end, tertiary circuit It is conductive that switching electromagnetic mechanism J2B and the 4th circuit switching electromagnetic mechanism J2C is both provided with second acted by electromagnetic force Armature D2, second conductive armature D2 one end movable contacts and to be electrically connected third output connection C4, the second conductive armature D2 another End by electromagnetic force in such a way that opposite third output connection C4 is movable by being contacted and being electrically connected the second incoming junction C5 or contact are simultaneously electrically connected third incoming junction C6, and the second conductive armature D2 other ends synchronous in linkage each other can contact it respectively From the second incoming junction C5 or third incoming junction C6；First circuit switches the first output connection of electromagnetic mechanism J1B The third incoming junction C6 of the wired electrical connection tertiary circuit switching electromagnetic mechanism J2B of point C2, second circuit switch electromagnetic mechanism The third incoming junction C6 of wired the 4th circuit of the electrical connection switching electromagnetic mechanism J2C of the first output connection C2 of J1C, first Circuit switches the second of wired the 4th circuit of the electrical connection switching electromagnetic mechanism J2C of the second output connection C3 of electromagnetic mechanism J1B Incoming junction C5, second circuit switch the wired electrical connection tertiary circuit switchings of the second output connection C3 of electromagnetic mechanism J1C The second incoming junction C5 of electromagnetic mechanism J2B.

The utility model first embodiment as shown in Figure 2：The wired electrical connection DC power supply of first electrode terminals is just The cathode of pole and the wired electrical connection DC power supply of second electrode terminals：When the first circuit switches the electricity of electromagnetic mechanism J1B and second Road switches the respective one end first conductive armature D1 electromagnetic mechanism J1C by electromagnetic force while being picked up makes the first input connect Point C1 and the first output connection C2 conductings and tertiary circuit switching electromagnetic mechanism J2B and the 4th circuit switching electromagnetic mechanism J2C Respective one end second conductive armature D2 electromagnetic force disappearance after by gravity simultaneously fall make third incoming junction C6 and When the C4 conductings of third output connection, the third output connection C4 of wired electrical connection tertiary circuit switching electromagnetic mechanism J2B P-wire L output direct current anode, the 4th circuit of wired electrical connection switches the third output connection C4's of electromagnetic mechanism J2C P-wire E exports direct current cathode；When the first circuit switches electromagnetic mechanism J1B and second circuit switching electromagnetic mechanism J1C respectively First one end conductive armature D1 fallen simultaneously by gravity after electromagnetic force disappearance and make the first incoming junction C1 and second Output connection C3 conductings and tertiary circuit switching electromagnetic mechanism J2B and the 4th circuit switching electromagnetic mechanism J2C respective second Conductive armature D2 is picked up by electromagnetic force simultaneously when making the second incoming junction C5 and the C4 conductings of third output connection, The p-wire L of the third output connection C4 of wired electrical connection tertiary circuit switching electromagnetic mechanism J2B exports direct current cathode, has Line is electrically connected the p-wire E output direct current anodes of the third output connection C4 of the 4th circuit switching electromagnetic mechanism J2C；Except this Except, when the first circuit switches the respective first conductive armature D1 of electromagnetic mechanism J1B and second circuit switching electromagnetic mechanism J1C mono- End is picked up simultaneously by electromagnetic force and tertiary circuit switching electromagnetic mechanism J2B and the 4th circuit switching electromagnetic mechanism J2C are each From the second conductive armature D2 by electromagnetic force simultaneously picked up when or when the first circuit switch electromagnetic mechanism J1B and second Circuit switch the respective one end first conductive armature D1 electromagnetic mechanism J1C electromagnetic force disappearance after by gravity simultaneously fall and Tertiary circuit switches electromagnetic mechanism J2B and the respective one end second conductive armature D2 the 4th circuit switching electromagnetic mechanism J2C in electricity When magnetic force is fallen after disappearing by gravity simultaneously, the third output of wired electrical connection tertiary circuit switching electromagnetic mechanism J2B connects The p-wire L of contact C4 switches the survey of the third output connection C4 of electromagnetic mechanism J2C without output, the 4th circuit of wired electrical connection Line E is tried without output.

The second embodiment of the utility model：As shown in figure 3, DC power polarity switching device only includes that second circuit is same Step switching relay, second circuit synchronism switching relay include the tertiary circuit switching that circuit switching is carried out by electromagnetic force Electromagnetic mechanism J2B and the 4th circuit switch electromagnetic mechanism J2C, and tertiary circuit switches electromagnetic mechanism J2B and the 4th circuit switching electricity Magnetic mechanism J2C is respectively arranged with the second incoming junction C5 and third incoming junction C6 and is each provided with third output connection Point C4, tertiary circuit switch the third of the second incoming junction C5 and the 4th circuit switching electromagnetic mechanism J2C of electromagnetic mechanism J2B Incoming junction C6 is electrically connected to each other and is electrically connected jointly as second electrode output end, and tertiary circuit switches electromagnetic mechanism J2B Third incoming junction C6 and the second incoming junction C5 of the 4th circuit switching electromagnetic mechanism J2C be electrically connected to each other and jointly Electrical connection is used as first electrode output end, tertiary circuit switching electromagnetic mechanism J2B and the 4th circuit switching electromagnetic mechanism J2C to be all provided with It is equipped with the second conductive armature D2 acted by electromagnetic force, second conductive armature D2 one end movable contacts are simultaneously electrically connected third Output connection C4, the second conductive armature D2 other ends pass through movable with opposite third output connection C4 by electromagnetic force Mode contacts and is electrically connected the second incoming junction C5 or contact and is electrically connected third incoming junction C6, the second conductive armature D2 The other end synchronous in linkage each other can contact its respective second incoming junction C5 or third incoming junction C6.

The utility model second embodiment as shown in Figure 3：The wired electrical connection DC power supply of first electrode terminals is just The cathode of pole and the wired electrical connection DC power supply of second electrode terminals：When tertiary circuit switches the electricity of electromagnetic mechanism J2B and the 4th Road, which switches the respective one end second conductive armature D2 electromagnetic mechanism J2C and fallen simultaneously by gravity after electromagnetic force disappearance, makes the When three incoming junction C6 and third output connection C4 are connected, wired electrical connection tertiary circuit switching electromagnetic mechanism J2B's The p-wire L output direct current anode of third output connection C4, the 4th circuit of wired electrical connection switch the of electromagnetic mechanism J2C The p-wire E of three output connection C4 exports direct current cathode；When tertiary circuit switches electromagnetic mechanism J2B and the switching of the 4th circuit The respective second conductive armature D2 of electromagnetic mechanism J2C are picked up simultaneously by electromagnetic force makes the second incoming junction C5 and third When output connection C4 conductings, the survey of the third output connection C4 of wired electrical connection tertiary circuit switching electromagnetic mechanism J2B It tries line L and exports direct current cathode, the 4th circuit of wired electrical connection switches the test of the third output connection C4 of electromagnetic mechanism J2C Line E output direct current anodes.

The first embodiment and second embodiment of the utility model are illustrated by taking duplex relay as an example, it is also possible to multi-joint Relay, multiple relays, to meet the requirement of at least two groups contacts of circuit.

The 3rd embodiment of the utility model：As shown in figure 4, DC power polarity switching device is cut including the first metal-oxide-semiconductor Change circuit and the second metal-oxide-semiconductor switching circuit, the first metal-oxide-semiconductor switching circuit includes the first metal-oxide-semiconductor T1 and the second metal-oxide-semiconductor T2, and second Metal-oxide-semiconductor switching circuit includes third metal-oxide-semiconductor T3 and the 4th metal-oxide-semiconductor T4, the leakage of the drain electrode and third metal-oxide-semiconductor T3 of the first metal-oxide-semiconductor T1 Pole is electrically connected to each other and is electrically connected jointly as first electrode input terminal, the leakage of the source electrode of the first metal-oxide-semiconductor T1 and the second metal-oxide-semiconductor T2 Pole is electrically connected to each other and is electrically connected jointly as second electrode output end, the source of the source electrode and the 4th metal-oxide-semiconductor T4 of the second metal-oxide-semiconductor T2 Pole is electrically connected to each other and is electrically connected jointly as second electrode input terminal, the leakage of the source electrode and the 4th metal-oxide-semiconductor T4 of third metal-oxide-semiconductor T3 Pole is electrically connected to each other and is electrically connected jointly as first electrode output end.

The utility model 3rd embodiment as shown in Figure 4：The wired electrical connection DC power supply of first electrode terminals is just The cathode of pole and the wired electrical connection DC power supply of second electrode terminals：When the first metal-oxide-semiconductor T1 and the 4th metal-oxide-semiconductor T4 cut-offs and the When two metal-oxide-semiconductor T2 are connected with third metal-oxide-semiconductor T3, the p-wire L output direct current anodes of wired electrical connection first electrode output end, The p-wire E of wired electrical connection second electrode output end exports direct current cathode；When the first metal-oxide-semiconductor T1 and the 4th metal-oxide-semiconductor T4 is led When logical and the second metal-oxide-semiconductor T2 ends with third metal-oxide-semiconductor T3, the third of wired electrical connection tertiary circuit switching electromagnetic mechanism J2B is defeated Go out the p-wire L output direct current cathode of tie point C4, the 4th circuit of wired electrical connection switches the third output of electromagnetic mechanism J2C The p-wire E output direct current anodes of tie point C4；In addition to this, the p-wire L of wired electrical connection first electrode output end without Output, the p-wire E of wired electrical connection second electrode output end is without output；But the first MOS need to be made by prior art measure Pipe T1 and the second metal-oxide-semiconductor T2 is not allowed to simultaneously turn on and need to make third metal-oxide-semiconductor T3 and the 4th metal-oxide-semiconductor T4 not also to be allowed to simultaneously Conducting, to ensure that metal-oxide-semiconductor will not be damaged.

The fourth embodiment of the utility model：As shown in figure 5, DC power polarity switching device includes tri- poles the first NPN Pipe switching circuit and the second NPN triode switching circuit, the first NPN triode switching circuit include the first NPN triode Q1 and Second NPN triode Q2, the second NPN triode switching circuit include third NPN triode Q3 and the 4th NPN triode Q4, and The collector of one NPN triode is electrically connected to each other with the collector of third NPN triode Q3 and is electrically connected jointly as the first electricity The collector of pole input terminal, the emitter of the first NPN triode Q1 and the second NPN triode Q2 are electrically connected to each other and are electrically connected jointly It connects as second electrode output end, the emitter of the emitter and the 4th NPN triode Q4 of the second NPN triode Q2 is mutually electrically connected It connects and is electrically connected jointly as second electrode input terminal, the collection of the emitter and the 4th NPN triode Q4 of third NPN triode Q3 Electrode is electrically connected to each other and is electrically connected jointly as first electrode output end.

The utility model fourth embodiment as shown in Figure 5：The wired electrical connection DC power supply of first electrode terminals is just The cathode of pole and the wired electrical connection DC power supply of second electrode terminals：When the first NPN triode Q1 and the 4th NPN triode Q4 Cut-off and the second NPN triode Q2 with third NPN triode Q3 when being connected, the p-wire of wired electrical connection first electrode output end L exports direct current anode, and the p-wire E of wired electrical connection second electrode output end exports direct current cathode；When tri- poles the first NPN When pipe Q1 is connected with the 4th NPN triode Q4 and the second NPN triode Q2 ends with third NPN triode Q3, wired electrical connection The p-wire L of first electrode output end exports direct current cathode, and the p-wire E outputs of wired electrical connection second electrode output end are straight Galvanic electricity anode；In addition to this, the p-wire L of wired electrical connection first electrode output end is without output, wired electrical connection second electrode The p-wire E of output end is without output；But the first NPN triode Q1 and the second NPN triode need to be made by prior art measure Q2 is not allowed to simultaneously turn on and third NPN triode Q3 and the 4th NPN triode Q4 need to be made also not to be allowed to simultaneously turn on, with Ensure that NPN triode will not be damaged.

5th embodiment of the utility model：DC power polarity switching device includes the first PNP type triode switching electricity Road and the second PNP type triode switching circuit, the first PNP type triode switching circuit include the first PNP type triode and second PNP type triode, the second PNP type triode switching circuit include third PNP type triode and the 4th PNP type triode, and first The emitter of PNP triode is electrically connected to each other with the emitter of third transistor and is electrically connected jointly and inputted as first electrode End, the collector of the first PNP type triode are electrically connected to each other with the emitter of the second PNP type triode and are electrically connected conduct jointly The collector of second electrode output end, the collector of the second PNP type triode and the 4th PNP type triode is electrically connected to each other and is total to It is used as second electrode input terminal with electrical connection, the collector of third PNP type triode and the emitter of the 4th triode are mutually electric Connection and jointly electrical connection are used as first electrode output end.

5th embodiment of the utility model is contrasted in fourth embodiment, therefore is omitted corresponding to the attached drawing of the 5th embodiment.

Claims (6)

1. a kind of DC bipolar Method of Cable Trouble Point locating test device, it is characterised in that：Bipolar polarity automatic or manual switching is single Member includes first electrode terminals, second electrode terminals, voltmeter, ammeter and has first electrode input terminal, the second electricity The DC power polarity switching device of pole input terminal, first electrode output end and second electrode output end, first electrode terminals Pass through the wired electrical connection second electrode terminals of voltmeter and direct wired electrical connection first electrode input terminal, second electrode wiring End will can be electrically connected by the wired electrical connection second electrode input terminal of ammeter, circuit switching device with first electrode terminals automatically The DC power polarity connect is conducted to first electrode output end or second electrode output end and automatically will be with second electrode terminals The DC power polarity of electrical connection is conducted to second electrode output end or first electrode output end, then makes first electrode output end Polarity and the polarity of second electrode output end it is opposite always；DC power supply is to supply electricity to the pattern of voltage, resistor detecting device It is electrically connected voltage, resistor detecting device and electrical connection pair is corresponded to the pattern for supplying electricity to bipolar polarity automatic or manual switch unit First electrode input terminal, the second electrode input terminal of pole polarity automatic or manual switch unit DC power polarity switching device, Voltage, resistor detecting device are electrically connected with central detection control apparatus with the pattern of two-way communication each other is mutually wired, center inspection It surveys control device and carries out the pattern of automatic or manual switching and bipolar polarity to control bipolar polarity automatic or manual switch unit The mutually wired electrical connection of automatic or manual switch unit and with bipolar polarity automatic or manual switch unit with two-way communication each other The mutually wired electrical connection of pattern, the first electrode of bipolar polarity automatic or manual switch unit DC power polarity switching device Output end, second electrode output end corresponding electrical connection is serially connected respectively the first resistance value variable resistance and the second resistance value can The tie point of variohm, the first resistance value variable resistance and the second resistance value variable resistance constitute quasi―balanced bridge circuit, by The bipolar signal detection unit that differential operational amplifier is constituted by the electrical signal of its own and center detection to be controlled Device is with the mutually wired electrical connection of the pattern of two-way communication each other.

2. DC bipolar Method of Cable Trouble Point locating test device according to claim 1, it is characterized in that：DC power polarity Switching device includes the first circuit synchronization switching relay and second circuit synchronism switching relay；First circuit synchronization switching after Electric appliance includes the first circuit switching electromagnetic mechanism and second circuit switching electromagnetic mechanism that circuit switching is carried out by electromagnetic force, First circuit switches electromagnetic mechanism and second circuit switching electromagnetic mechanism is respectively arranged with the first incoming junction and corresponds to respectively It is provided with the first output connection, the second output connection, the first circuit switches electromagnetic mechanism and second circuit switches electromagnetic motor Respective first incoming junction of structure is respectively to should be used as first electrode input terminal and second electrode input terminal, the switching of the first circuit Electromagnetic mechanism and second circuit switching electromagnetic mechanism are both provided with the first conductive armature acted by electromagnetic force, and first leads Electric armature one end movable contact simultaneously be electrically connected the first incoming junction, the first conductive armature other end by by electromagnetic force with The opposite movable mode of first incoming junction contacts and is electrically connected the first output connection or contact and is electrically connected the second output Tie point, the first conductive armature other end synchronous in linkage each other can contact its respective first output connection or the second output Tie point；Second circuit synchronism switching relay includes the tertiary circuit switching electromagnetic motor that circuit switching is carried out by electromagnetic force Structure and the 4th circuit switch electromagnetic mechanism, and tertiary circuit switching electromagnetic mechanism and the 4th circuit switching electromagnetic mechanism are respectively arranged with Second incoming junction and third incoming junction and it is each provided with third output connection, tertiary circuit switches electromagnetic mechanism With the respective third output connection of the 4th circuit switching electromagnetic mechanism respectively to should be used as first electrode output end and the second electricity Pole output end, tertiary circuit switching electromagnetic mechanism and the 4th circuit switching electromagnetic mechanism are both provided with by electromagnetic force and act The second conductive armature, second conductive armature one end movable contact is simultaneously electrically connected third output connection, and the second conductive armature is another One end by electromagnetic force in such a way that opposite third output connection is movable by being contacted and being electrically connected the second incoming junction Or contact and be electrically connected third incoming junction, the second conductive armature other end can each other in linkage synchronous contact its respective the Two incoming junctions or third incoming junction；First circuit switches the wired electrical connection of the first output connection the of electromagnetic mechanism Three-circuit switches the third incoming junction of electromagnetic mechanism, and second circuit switches the wired electricity of the first output connection of electromagnetic mechanism The third incoming junction of the 4th circuit switching electromagnetic mechanism is connected, the first circuit switches the second output connection of electromagnetic mechanism The 4th circuit of wired electrical connection switches the second incoming junction of electromagnetic mechanism, and second circuit switches the second output of electromagnetic mechanism Second incoming junction of the wired electrical connection tertiary circuit switching electromagnetic mechanism of tie point.

3. DC bipolar Method of Cable Trouble Point locating test device according to claim 1, it is characterized in that：DC power polarity Switching device only include second circuit synchronism switching relay, second circuit synchronism switching relay include by electromagnetic force into Row circuit switching tertiary circuit switching electromagnetic mechanism and the 4th circuit switch electromagnetic mechanism, tertiary circuit switch electromagnetic mechanism and 4th circuit switching electromagnetic mechanism is respectively arranged with the second incoming junction and third incoming junction and is each provided with third Output connection, the third that tertiary circuit switches the second incoming junction of electromagnetic mechanism and the 4th circuit switches electromagnetic mechanism are defeated Enter tie point to be electrically connected to each other and be electrically connected jointly as second electrode output end, the third that tertiary circuit switches electromagnetic mechanism is defeated The second incoming junction for entering tie point and the 4th circuit switching electromagnetic mechanism is electrically connected to each other and is electrically connected jointly as first Electrode output, tertiary circuit switching electromagnetic mechanism and the 4th circuit switching electromagnetic mechanism are both provided with by electromagnetic force and move The second conductive armature made, second conductive armature one end movable contact are simultaneously electrically connected third output connection, the second conductive armature The other end by electromagnetic force in such a way that opposite third output connection is movable by being contacted and being electrically connected the second input connection Point contacts and is electrically connected third incoming junction, and the second conductive armature other end can synchronize contact in linkage each other, and its is respective Second incoming junction or third incoming junction.

4. DC bipolar Method of Cable Trouble Point locating test device according to claim 1, it is characterized in that：DC power polarity Switching device includes the first metal-oxide-semiconductor switching circuit and the second metal-oxide-semiconductor switching circuit, and the first metal-oxide-semiconductor switching circuit includes the first MOS Pipe and the second metal-oxide-semiconductor, the second metal-oxide-semiconductor switching circuit include third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, the drain electrode of the first metal-oxide-semiconductor and third The drain electrode of metal-oxide-semiconductor is electrically connected to each other and is electrically connected jointly as first electrode input terminal, the source electrode of the first metal-oxide-semiconductor and the 2nd MOS The drain electrode of pipe is electrically connected to each other and is electrically connected jointly as second electrode output end, the source electrode of the second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor Source electrode is electrically connected to each other and is electrically connected jointly as second electrode input terminal, the drain electrode of the source electrode of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor It is electrically connected to each other and is electrically connected jointly as first electrode output end.

5. DC bipolar Method of Cable Trouble Point locating test device according to claim 1, it is characterized in that：DC power polarity Switching device includes the first NPN type triode switching circuit and the second NPN type triode switching circuit, the first NPN type triode Switching circuit includes the first NPN type triode and the second NPN type triode, and the second NPN type triode switching circuit includes third NPN type triode and the 4th NPN type triode, the collector of the first NPN triode and the collector of third transistor are mutually electric Connection and common electrical connection are used as first electrode input terminal, the emitter of the first NPN type triode and the second NPN type triode Collector is electrically connected to each other and is electrically connected jointly as second electrode output end, the emitter of the second NPN type triode and the 4th The emitter of NPN type triode is electrically connected to each other and is electrically connected jointly as second electrode input terminal, third NPN type triode Emitter is electrically connected to each other with the collector of the 4th triode and is electrically connected jointly as first electrode output end.

6. DC bipolar Method of Cable Trouble Point locating test device according to claim 1, it is characterized in that：DC power polarity Switching device includes the first PNP type triode switching circuit and the second PNP type triode switching circuit, the first PNP type triode Switching circuit includes the first PNP type triode and the second PNP type triode, and the second PNP type triode switching circuit includes third PNP type triode and the 4th PNP type triode, the emitter of the first PNP triode and the emitter of third transistor are mutually electric Connection and common electrical connection are used as first electrode input terminal, the collector of the first PNP type triode and the second PNP type triode Emitter is electrically connected to each other and is electrically connected jointly as second electrode output end, the collector of the second PNP type triode and the 4th The collector of PNP type triode is electrically connected to each other and is electrically connected jointly as second electrode input terminal, third PNP type triode Collector is electrically connected to each other with the emitter of the 4th triode and is electrically connected jointly as first electrode output end.